Vibratory-diaphragm signaling device



D. A. McCONNELL. VIBRATORY DIAPHRAGM SIGNALING DEVICE.

APPLICATION FILED APR. 24, I918.

Patented D0013, 1921.

3 SHEETS-SHEET 1- WITNESS: Z Z %NTOR AITORIVEY 0. McCONNELL. VIBRATORYDIAPHRAGM SIGNALING DEVICE- APPLICATION HLED APR. 24, 1 918 1,400,085.Patented Dec. 13, 1921.

3 SHEETS-SHEET 2.

MAT-105MH- n. A. McCONNELL. VIBRATORY DIAPHRAGM SIGNALING DEVICE.

APPLICATION FILED APR.'24, 1918- Patelited Dec. 13, 1921.

3 SHEETS-SHEET 3- i 1 INVENTOI? I UNITED STATES PATENT OFFICEL' DUNCANALHANDEB'IOCONNELL, '01 ARLINGTON, NEW I mom OOIPANYQA CORPORATION OIDELAWARE.

, ASSIGNOR' '10 VIBM'IOBY-DIAPHRAGI SIGNALING DEVICE. I

To all evhom'z't may concern:

Be it-known that I, Duncan A. McConmm, a citizen of the United States,and

resident of Arlin n, in the county-of Hudson and, State of cw J ersey,have invented certain new and useful Improvements in Vibratory-DiaphragmSignaling Devices, of which the following is a specification.

This invention 1s a signaling device of that type in which soundproducing vibra-' tions are imparted to a diaphragm by the high speedrotation of an electr c motordriven member presenting cammmg teeth 01'projections engaging with a wear-piece or other part carried .by orotherwise operatively positioned in respect to the diaphragm.

In my prior Patent No. 1,160,902 issued November 16th, 1915, Ihavefillustratcd a construction of this character in which the motor isso-designed as to permit the use of a comparatively large armatureeccentrically positioned in a cylindrical casing coaxial with thediaphragm and resonator.

Such motor, involves a U-shaped motor frame with its side memberssupported by disk serving the treble function of a diaphragm clam acasing support, and an armature sha t support. r

The main object of my present invention is to secure certain importantadvantages of my prior construction and at thesame time to materiallyreduce the cost of manufacture'and increase the power without increasmgthe size. As .an important result of my, invention, I am. able toconstruct most of the parts of simple, inexpensive stampings, so cut andshaped that they may be easily and quickl assembled and accuratelyfitted toget er by comparatively unskilled labor, the minimum number ofparts requiringthe services of expert mathese drawings,

chinists. Further important features of my invention involve the simpleand effective ,construction of the commutator brush supports and thearmature shaft adjusting means.

In the accom anying drawings, I have shown one embodiment of myinvention. In

Figure 1 is a central longitudinal section,

Fig. 2 is an end view on a larger scale,

the casing being shown in section on the line 22 of Fig. 1, and

Specification of Letters Patent.

Application filed April 24, 1918. Serial No. 230,448

'rearwardly from. a dished Patented Dec. 13, 1921.

Fi the Fig.

I hav e illustrated my invention as embodied in a horn having avibratory diapiitragm 10, the pen hery of which is held ween two opposeclamping members 11 and 12 which may be of any suitable character andwhich may hold the diaphragm 111 any suitable manner as, for instance,by an annular row of bolts 13 and annular washers. The front diaphragmclamp 11 carr1es a resonator or sound wave projector 14 which isillustrated as being substantially cylindrical but of somewhat smallerdiameter at its front end than at the end adiacent the diaphragm.

he rear-diaphragm clamp 12 is shown as constituting a peripheral portionof a circular dished plate or disk, the center portion 15 of which isspaced from and substantially parallel to the diaphragm and is connectedto the clamping portion by cylindrical and conical tapering portions 16and 17. A cup-shaped caslng of substantially cylindrical form is shownas telescoping with and securedto this cylindrical portion 16 of theplate. It may be secured in position in any suitable manner but is shownas having a projection 19 sprung into a corre- 3 and 4 are longitudinalsections on nes 33 and 4-4, respectively, of

sponding socket atone point and a screw 20 entering a threaded apertureat a substantially diametrically opposite point on the cylindricalportion 16. The horn may be secured in position by various forms ofclamps or brackets. In Fig. 2, I have shown a bracket 21 having aportion adapted to rest against the rear surface of the diaphragm clamp12 and be held in place by two of the bolts or screws 13.v For effectingvibration of the diaphra the latter may carry a wear-piece 10 w1th whichthe cam projections or teeth of a rotor 22 may engage. This rotor isdisposed between the diaphragm and the plate 15 and is shown as beingsecured to a shaft 23 by means of a locking screw 24.

The specific details of the. part so far referred to are not essentialto .my present invention and maybe-the same as shown in my prior PatentNo. 1,160,902, above referred to, or they may be widely varied even tothe extent of radically re-designing them.

My invention involves particularly a construction of the motor employedfor rotating the-shaft 23 and adapted to be supported by by the sidemembers of said frame. The

frame is shown as being made up of two pairs of rods 25 and atransversely extending sheet metal connecting piece26. The rods are allsubstantially parallel and at right angles to the plane of the plate 1 5a r 1d each has one end riveted or otherwise rigidlysecured to saidplate. The cross or connecting member 26 is secured to the outer ends ofthese rods preferably by means of screws 27 extending through saidmember into the outer ends of the corresponding rods.

The rods serve to support and rigidly hold in place the polepieces andfield coil carrier. These are preferably laminated and formed of aseries of superposed sheet metal plates 28, each cut to form two polepiece pro ections 29 and a field coil supporting portion 30. The edgesof the pole piece sections are cut concave so that when the plates areassembled. there is formed a circular passage or chamber for a rotaryarmature 31 mounted on the shaft 23.

A coil 32 is mounted or wound on the supporting portions 30 and lieswith its axis substantially parallel to the diaphragm and at one side ofthe armature, the axis of the latter being substantially normal to thediaphragm. For supporting this laminated field on the rods 25 andrigidly holding it at the desired position between the plate 15 and theconnecting member 26 of the frame, the plates 28 are apertured toreceive'the rods and the latter are provided with opposing shoulders forengaging with the opposite sides of the upper and lower sheets 28.

' These shoulders are formed by tubes 33 and 34 slidably mounted on therods. After the rods are rigidly secured to the plate or base 15, thetubes 33 are placed in position, each with one end resting against saidbase or plate 15. The laminated field is then slid on the rods until itrests on the ends of the tubes 33 and the tubes 34 are then placed inposition and the whole structure locked rigid by the screws 27 whichenter the ends of the rods and have their heads binding the transverseframe member againstthe ends of the tubes 34.

Where the rear wall 15 of the rear diaphragm clamping member is made ofsheet of non-magnetic material such as brass. The sleeves 33, if thinenough, may be made of steel without causing too great weakening of thefield in this way, but, in most cases, prefer to make these sleeves ofbrass, the same as the rods. The upper sleeves 34 being much longer thanthe lower ones, it is possible to get steel tubing thin enough for usein this location without getting too great short-circuiting of themagnetic field through the stamping 26.

All of these parts are simple and inexpensive to manufacture and may beassembled without the aid of complicated machinery, special tools, orparticularly skilful labor. The armature has its commutator 35positioned above the field and preferablybeneath the transverse framemember 26. For supporting a pair of tubular brushes in engagement withthis commutator, thetubular sleeves 37 preferably of fiber or othersuitable non-conducting material, are carried by the frame member 26upon opposite sides of the commutator and preferably between the tworods of each pair which pairs form the side members of the U-shapedframe. The transverse member 26 may be bent upwardly slightly to form aslight socket or seat for the sleeve, as is shown particularly in Fig.4, and .each sleeve-may be held in place by a band or loop, 38 extendingbeneath the sleeve and having its opposite ends 39 projecting throughslots in the member 26 and bent over to prevent their withdrawal. Theseats or sockets in the under surface of the member 26 may be of alength substantially equal to the length of the sleeves 37 so that theends of the seats or sockets hold the sleeve against endwise movement.

For conducting electricity to the brushes 37, the sleeves 38 eachpreferably have a metallic or conducting lining 40 within whichthe'brushes 36 slide. The insulated wires 41 merely have theirun-insulated terminal portions extending through diametrically oppositeapertures at the outer ends of the sleeves 37 and their linings 40.Between the portions of these wires which extend across the sleeves arecoil springs 42 which serve partly as conductors although the lining 40serves as the main conductor between the brushes and the wires. Thesprings merely hold the brushes in proper engagement with thecommutator.-

To facilitate the compression of the springs portion 44 extending alonga slot placing of the disk. By having it of greater length than thecompressed spring, its end.

positive endwise adjustment of the shaft,

either toward or from the diaphragm, to control the amount of overlap ofthe cam projections on the wear-piece, the frame member 26 has a boss 46within which is threaded a sleeve 47'.v This sleeve constitutes thebearing for the shaft 23 although the latter may have its outerextremity of reduced diameter so as to reduce the amount of bearingsurface as indicated in Fig. 3. This sleeve may be adjusted endwiseuntil its inner end abuts against a washer 48, or other insulated part,on the shaft at the end of the commutator.

Thus, by rotating the sleeve 47, the shaft may be forced endwise towardthe diaphragm. The end of the shaft has a threaded axial passage withinwhich is secured a. screw 49, the head of which is larger than the shaftso that it may abut against the, outer end of the sleeve 47. The partsare so proportioned that the screw 49, when tightened, only slightlyengages with but does not bind upon the outer end of the sleeve. Theshaft is thus held against endwise movement in either direction inrespect to thesleeve but may rotate in respect to it, and the normallystationary sleeve may be rotated to adjust the shaft in eitherdirection. To facllitate the rotation of the sleeve, its outer end maybeso shaped that a wrench may be quickl fitted thereto and a lock nut 50may encirc e the sleeve and abut against the boss- 46 to normally lookthe sleeve against move-- ment Having thus described my invention, whatI claim as new and desire to secure by Letters Patent is:

1. An electric motor, includin a pair of supporting rods, pole piecescarried thereby intermediate of the ends thereof, a stamped metal memberconnecting said rods, a pair of lined sleeves, a band encircling eachsleeve and havin its end portions secured to said member, rusheslongitudinally movable within said sleeves, and an armature shaftjournaled in said member intermediate of said sleeves.

2. An electric motor, having a transversely extending frame member, asleeve threaded therein, an armature shaft journaled in said sleeve andhaving a portion abutting against one end of said sleeve, and a membercarried by said shaft at the free end of the latter and engagin with theopposite end of said sleeve where y said shaft may be adjust-- edendwise in either direction'by a rotation of said sleeve within saidframe member.

Si ed at New York city, in the county of New%ork and State of New York,this 18th day of April, A. D. 1918.

DUNCAN ALEXANDER IcCONNELL

